A connecting structure of a drain hose is disclosed which should resist even when the drain hose deforms or moves during its operation following to opening and closing movement of the roof member. The lower back section weather strip (73) is provided to and extending along a lower edge of the back window (23) forming the retractable roof (2). The insert panel (75) for reinforcing the lower back section weather strip (73) is built in the lower back section weather strip (73) at a portion where the drain hose (8) is to be connected. The receiving tray (81) is attached to the insert panel (75) for connecting an upstream end of the drain hose (8).
